学科分类
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24 个结果
  • 简介:TheGAuDIarchitectureandframeworkaredesignedtoprovideacomoninfrastructureandenvironmentforsimulation,filtering,reconstructionandanalysisapplications.InitiallydevelopedfortheLHCbexperiment,GAUDIhasbeenadoptedandextendedbytheATLASexperimentandadoptedbyseveralotherexperimentsincludingGLASTandHARP.wedescribethepropertiesandconceptsembodiedbyGAUDIandrecentfunctionalityadditionsandhowtheprojecthasevolvedfromaproductdevelopedbyatightly-knitteaminasinglesite,toacollaborationbetweenmultipleteamsatgeographicallydispersedsites,basedlooselyonopensourceconcepts.Wedescribethemanagementinfrastructureaswellashowweaccommodateexperment-specificextensionsandadaptationsaswellasanexperiment-neutralkernel.

  • 标签: GAUDI事件处理 目标取向数据库 结构
  • 简介:TheOnlinecomputingsystemfortheDZEROexperimentisusedtocontrolmonitor,andacquiredatafromtheapproximately1-millionchanneldetector,ThispaperdescribestheOnlineHostsystemeventdatapathrequirementsanddesign.

  • 标签: DZERO实验 数据收集 数据监视
  • 简介:Inthispaper,thetheoryofmajorefficiencyformultiobjectiveprogrammingisestablished.Themajor-efficientsolutionsandweaklymajor-efficientsolutionsofmultiobjectiveprogramminggivenhereareParetoefficientsolutionsofthesamemultiobjectiveprogrammingproblem,buttheconverseisnottrue.Inaceratinsense,thesesolutionsareinfactbetterthananyotherParetoefficientsolutions.Somebasictheoremswhichcharacterizemajor-efficientsolutionsandweaklymajor-efficientselutionsofmultlobjectiveprogrammingarestatedandproved.Furthermore,theexistenceandsomegeometricpropertiesofthesesolutionsarestudied.

  • 标签: 多目标规划 弱较多有效解 较多有效解 多目标程序设计
  • 简介:Thispaperdescribesthedynamicbehaviorofextendedtimedeventgraphsrelatedtoplacedelayinthedioidframework.ByCoferandGarg'ssupervisorycontroltheory,weaddresscontrolproblemsofextendedtimedeventgraphs.Supervisorycontrolofextendedtimedeventgraphs(aclassofdiscreteeventdynamicsystems)isstudiedinthedioidframework,anecessaryandsufficientconditionfortheidealsofthesetoffiringtimesequencesoftransitionstobecontrollableispresented.Weproveallthestronglycontrollablesubsetscanformacompletelattice,

  • 标签: 管理控制 扩展同步事件图 动态行为 Dioid框架 极大代数 离散事件动态系统
  • 简介:StdHepC++[1]isaCLHEP[2]MonteCarloeventclasslibrarywhichprovidesacommoninterfacetoMonteCarloEventGenerators,ThisworkisanextensiveredesignoftheStdHepFortraninterfacetousethefullpowerofobjectorienteddesign,AgeneratedeventmapsnaturallyontotheDirectedAcyclicGraphconceptandwehaveusedtheHepMCclassestoimplementthis.Thefullimplementationallowstheusertocombineeventstosimulatebeampileupandaccessthemtransparentlyasthoughtheywereasingleevent.

  • 标签: MONTE Carlo传感器 标准事件分类 StdHepC++
  • 简介:Thehumancardiovascularsystemisaclosedloopandcomplexvascularnetworkwithmulti-scaledheterogeneoushemodynamicphenomena.Here,wegiveaselectivereviewofrecentprogressinmacro-hemodynamicmodeling,withafocusongeometricalmulti-scalemodelingofthevascularnetwork,micro-hemodynamicmodelingofmicrocirculation,aswellasbloodcellular,subcellular,endothelialbiomechanics,andtheirinteractionwitharterialvesselmechanics.Wedescribeindetailthemethodologyofhemodynamicmodelinganditspotentialapplicationsincardiovascularresearchandclinicalpractice.Inaddition,wepresentmajortopicsforfuturestudy:recentprogressofpatient-specifihemodynamicmodelinginclinicalapplications,micro-hemodynamicmodelingincapillariesandbloodcells,andtheimportanceandpotentialofthemulti-scalehemodynamicmodeling.

  • 标签: 血流动力学 心血管系统 多尺度建模 动力学模型 临床应用 多尺度模型
  • 简介:CongestioncontrolforpacketssentonanetworkisimportantforDAQsystemsthatcontainaneventbuilderusingswitchingnetworktechnologies.QualityofService(QoS)isatechniqueforcongestioncontrol.RecentLinuxreleasesprovideQoSinthekerneltomanagenetworktraffic.Wehaveanalyzedthepacket-lossandpacketdistributionfortheeventbuilderprototypeoftheAtlasTDAQsystem.WeusedPC/LinuxwithGigabitEthernetnetworkasthetestbed.TheresultshowedthatQoSusingCBQandTBFeliminatedpacketlossonUDP/IPtransferwhiletheUDP/IPtransferinbesteffortmadelotsofpacketloss.TheresultalsoshowedthattheQoSoverheadwassmall.WeconcludedthatQoSonLinuxperformedefficientlyinTCP/IPandUDP/IPandwillhaveanimportantroleoftheAtlasTDAQsystem.

  • 标签: ATLAS 数据处理 数据流管理 拥挤控制
  • 简介:Providingefficientaccesstomorethan300TBofexperimentdataistheresponsibilityoftheBaBar^1DatabasesGroup.Unlikegenerictools,TheEventBrowserpresentsuserswithanabstractionoftheBaBardatamodel.MultithreadedCORBA^2serversperformdatabaseoperationsusingsmalltransactionsinanefforttoavoidlockcontentionissuesandprovideadequateresponsetimes.TheGUIclientisimplementedinJavaandcanbeeasilydeployedthroughoutthecommunityintheformofawebapplet.Thebrowserallowsuserstoexaminecollectionsofrelatedphysicseventsandidentifyassociationsbetweenthecollectionsandthephysicalfilesinwhichtheyreside,helpingadministratorsdistributedatatoothersitesworldwide,ThispaperdiscussesthevariousaspectsoftheEventBrowserincludingrequirements,designchallengesandkeyfeaturesofthecurrentimplementation.

  • 标签: 事件存储 事件浏览器 BaBar目标数据库 BaBar实验
  • 简介:TheneuralnetworkrealtimeeventselectionfortheDIRACewperimentatCERNispresented.Itcomprisesoftwoindependentparts.OneusesplasticscintillatorsandtheothertheverticalScintillatingFibres,Theglobaleventdecisionistakeninlessthan250ns.Signaleventsareselectedwithanefficiencyosmorethan0.99withabackgroundratereductionofabout2.

  • 标签: DIRAC实验 人工神经网络 实时事件选择
  • 简介:Recurrenteventdataoftenarisesinbiomedicalstudies,andindividualswithinaclustermightnotbeindependent.Weproposeasemiparametricadditiveratesmodelforclusteredrecurrenteventdata,whereinthecovariatesareassumedtoaddtotheunspecifiedbaselinerate.Fortheinferenceonthemodelparameters,estimatingequationapproachesaredeveloped,andbothlargeandfinitesamplepropertiesoftheproposedestimatorsareestablished.

  • 标签: 半参数模型 添加剂 事件 集群 复发 价格
  • 简介:Itiswidelyacceptedthatinaturbulentboundarylayer(TBL)withadversepressuregradient(APG)anouterpeakusuallyappearsintheprofileofstreamwiseReynoldsstress.However,theeffectofAPGonthisouterpeakisnotclearlyunderstood.Inthispaper,theeffectofAPGisanalysedusingthenumericalandexperimentalresultsintheliterature.BecausetheeffectofupstreamflowisinherentintheTBL,wefirstanalysethiseffectinTBLswithzeropressuregradientonflatplates.Undertheindividualeffectofupstreamflow,anouterpeakalreadyappearsintheprofileofstreamwiseReynoldsstresswhentheTBLcontinuesdevelopinginthestreamwisedirection.TheAPGacceleratestheappearanceoftheouterpeak,insteadofbeingatrigger.

  • 标签: 湍流边界层 雷诺应力 边界层流 压力梯度 应力分布 最大值
  • 简介:离子光子排放显微镜学(IPEM)是新导致离子的排放显微镜学。它与高精力和在一件样品上侵犯的低fluence率采用一根宽广离子横梁。一个单个离子的位置被一个光系统与联合的客观透镜,棱柱,显微镜试管和充电检测设备(电荷耦合器件)。与Ag离子做的一部薄ZnS电影被用作光材料。在照耀的Cl离子创造的ZnS(Ag)电影的光子的产生效率和传播效率是计算的。一个单个Cl离子光显微镜的图象被高量效率电荷耦合器件观察。在这个IPEM系统给的一个单个Cl离子的分辨率是6m。影响分辨率的几个因素被讨论。一根硅二极管被用来收集事件离子引起的电的信号。光图象和电子信号的有效、意外的巧合被说明。单个事件效果的一张二维的地图根据有效巧合的数据被抽出。

  • 标签: 单粒子效应 光子发射 离子束 显微镜 效应试验 ZNS薄膜
  • 简介:ThedataacquisitionsystemfortheCMSexperimentattheLargeHadronCollider(LHC)willrequirealargeandhighperformanceeventbuildingnetwork.Severalarchitecturesandswithchtechnologiesarecurrentlybeingevaluated.Thispaperdescribesdemonstratorswhichhavebeensetuptostudyasmall-scaleeventbuilderbasedonPCsemulatinghighperformancesourcesandsinksconnectedviaEthernetorMyrinetswitches.Resultsfromongoingstudies,includingmeasurementsonthroughputandscaling,arepresented.

  • 标签: CMS实验 数据收集 开关技术
  • 简介:Inthispaper,theparametricequationswithmultipliersofnonholonomicnonconservativesys-temsintheeventspaceareestablished,theirpropertiesarestudied,andtheirexplicitformulationisobtained.Andthenthefieldmethodforintegratingtheseequationsisgiven.Finally,anexampleillustratingtheappli-cationoftheintegrationmethodisgiven.

  • 标签: EVENT SPACE NONHOLONOMIC NONCONSERVATIVE system parametric
  • 简介:ThestudiesundertakentopreparetheTechnicalDesignReportoftheATLAS3^rdLevelTrigger(EventFilter)areperformedondifferentprototypesbasedondifferenttechnologies.wepresentherethemostrecentresultsobtainedforthesupervisionoftheprototypebasedonconventional,off-the-shelfPCmachinesandJavaMoblieagenttechnology.

  • 标签: ATLAS实验 事件滤器 软件开发 控制软件
  • 简介:LinuxbasednetworkedPCsclustersarereplacingboththeVMEnonuniformdirectmemoryaccesssystemsandSMPsharedmemorysystemsusedpreviouslyfortheonlineeventfilteringandreconstrucion.ToallowanoptimaluseofthedistributedresourcesofPCclustersanopensoftwareframeworkispresentlybeingdevelopedbasedonadataflowparadigmforeventprocessing.Thisframeworkallowsforthedistributionofthedataofphysicseventsandassociatedcalibrationdatatomultiplecomputersfrommultipleinputsourcesforprocessingandthesubsequentcollectionoftheprocessedeventsatmultipleoutputs.Thebasisofthesystemistheeventrepository,basicallyafirst-infirst-outeventstorewhichmaybereadandwritteninamannersimilartosequentialfileaccess.Eventsarestoredinandtransferredbetweenrepositoriesassuitablylargesequencestoenablehighthroughput.Multiplereaderscanreadsimultaneouslyfromasinglerepositorytoreceiveeventsequencesandmultiplewriterscaninserteventsequencestoarepository,Hencerepositoriesareusedforeventdistributionandcollection.Tosupportsynchronisationoftheeventfolowtherepositoryimplementsbaaiers.Abarriermustbewrittenbyallthewritersofarepositorybeforeanyreadercanreadthebarrier,Areadermustreadabarrierbeforeitmayreceivedatafrombehindit.Onlyafterallreadershavereadthebarrieristhebarrieremovedfromtherepository.Abarriermayalsohaveattacheddata,Inthiswaycalibrationdatacanbedistributedtoallproessuingunits.Therepositoriesareimplementedasmulti-threadedCORBAobjectsinC++andCORMAisusedforalldatatransfers,JobsetupscriptsarewritteninpythonandinteractivestatusandhistogramdisplayisprovidedbyaJavaprogram.JobsrununderthePBSbatchsystemprovidingshareduseofresourcesforonlinetriggering,offlinemassreporcessinganduseranalysisjobs.

  • 标签: H1实验 数据流 数据处理
  • 简介:ThispaperisdevotedtostudyingtheconformalinvarianceandNoethersymmetryandLiesymmetryofaholonomicmechanicalsystemineventspace.Thedefinitionoftheconformalinvarianceandthecorrespondingconformalfactorsoftheholonomicsystemineventspacearegiven.ByinvestigatingtherelationbetweentheconformalinvarianceandtheNoethersymmetryandtheLiesymmetry,expressionsofconformalfactorsofthesystemunderthesecircumstancesareobtained,andtheNoetherconservedquantityandtheHojmanconservedquantitydirectlyderivedfromtheconformalinvariancearegiven.Twoexamplesaregiventoillustratetheapplicationoftheresults.

  • 标签: NOETHER对称性 约束机械系统 共形不变性 事件空间 对称空间 HOJMAN守恒量
  • 简介:Thispaperpresentstwoapproachestoperformtheelectronicdeviceheatingduringradiationhardnessassurancetests.Commonlyusedconductiveheatingapproachiscomparedwithcontactlesslaser-basedapproach,characteristicsandlimitationsofthesemethodsaredescribed.Experimentalresultsfortemperaturedependenceofsingle-eventlatchup(SEL)cross-sectionduringheavyionirradiationalongwithsomeaspectsofphysics-basednumericalsimulationofheattransferprocessesarepresented.

  • 标签: Single-event effect(SEE)tests HEAVY ions radiation hardness
  • 简介:Inordertodeepentheunderstandingofthedifferencebetween0!1and1!0sinleeventupset(SEU)cross-sectioninanovelactivedelayelement(ADE)SRAM(StaticRandomAccessMemory)cell,theirradiationwascarriedoutatHeavyIonResearchFacilityinLanzhou(HIRFL).Usingthe86Kr26+ionsirradiatedthedeviceundertest(DUT)adoptedpartiallydepleted(PD)siliconofinsulator(SOI)technology.ThefeaturesizeofDUTfabricatedbyinstituteofmicroelectronic(IME)was180nm.TheschematicdiagramofSEUhardenADE-SRAMcellisshowninFig.1.TheADEisessentiallyaNMOSconnectedinonlyoneofthefeedbackpathsbetweenthetwoinventorsofthememorycell.Itplaysaroleasswitchingtransistor.Exceptduringawriteoperation,whentheswitchtransistoristurnedon(soasnottocompromisethewritespeed),theoff-ADEprovidesamuchgreaterRCdelaybetweenthetwoinventorsofthememorycelltoachievemuchimprovedSEUhardness[1].

  • 标签: SINGLE EVENT Upset